Citizens whose nationality corresponds to countries members of the OECD (Organisation for Economic Co-operation and Development) do not need visa to enter Argentina for conferences. They can enter the country simply showing their valid passport.
Check the list of OECD countries here: https://www.oecd.org/about/document/ratification-oecd-convention.htm
If your country is not part of the OECD, you will most likely need a Visa to enter Argentina. Please contact us to [email protected] for more information.